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Derivatives of Trig Functions
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Derivatives: How to Find
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The Product Rule
The Quotient Rule
Now, we want to be able to take the derivative of a fraction like
f
/
g
, where
f
and
g
are two
functions. This one is a little trickier to remember, but luckily it comes with its own song. The
formula is as follows:
How to Remember this Formula (with thanks to Snow White and the Seven Dwarves):
Replacing
f
by
hi
and
g
by
ho
(
hi
for high up there in the numerator and
ho
for low down there in
the denominator), and letting
D
stand in for `the derivative of', the formula becomes:
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 Derivative, Quotient Rule, Sneezy, JOEL HASS, hi dee ho, ho dee hi

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